This challenge led me to Egypt, the land of pharoahs and pyramids, the beautiful Nefertiti, and the ancient secrets of the River Nile. The Great Pyramid of Giza is one of the seven wonders of the world. Until the advent of modern skyscrapers, it was the tallest structure in the world. To date, its many passages have yielded no mummies or treasure, and the passages led to empty chambers. It is believed that either ancient tomb raiders have plundered all the treasure, or that the mummy of the Pharoah Khufu is still cleverly hidden within or beneath the Great Pyramid.